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RFC 1700 - ipv6-parameters

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    IP VERSION 6 PARAMETERS

    1. Version Number = 6

    2. Priority

    	0 - uncharacterized
    	1 - filler
    	2 - unattended
    	3 - (reserved)
    	4 - attended bulk
    	5 - (reserved)
    	6 - interactive
    	7 - internet control

    3. Payload Length

    4. Flow Label

    5. Next Header

    5.a. Header types

    	00 = Hop-by-Hop Options
    	43 = Routing
    	44 = Fragment
    	51 = Authentication
    	60 = Destination Options
    	50 = Encapsulating Security Payload
    	xx = Upper Layer Header
            58 = Internet Control Message Protovol (ICMP)
    	59 - no next header

    For the "xx" values see the list of protocol numbers for the values to
    use for the upper layer protocol (see the file: protocol-numbers).

    5.b. Options

    The options have a type, length. value (TLV) structure.

    The type is a 2-bit action code, a 1-bit change code, and a 5-bit
    operation code.

    The action codes are:

    	00 - skip
    	01 - discard
    	10 - discard and report
    	11 - discard and report if not multicast

    The change codes are:

    	0 - no change en-route
    	1 - change allowed en-route

    The operation codes are:

    	0 - Pad 1 (special case: this option is just this one octet)
    	1 - Pad N
    	2 - Jumbo Payload Length
    	3 - Endpoint Identifier for Nimrod

    5.c. Routing Types

    	0 - Source Route
    	1 - Nimrod

    6. Hop Limit

    7. Source Address

    8. Destination Address

    []

Connected: An Internet Encyclopedia
RFC 1700 - ipv6-parameters